You Make a Phospholipid Bilayer with Short,saturated Hydrocarbon Tails

You make a phospholipid bilayer with short,saturated hydrocarbon tails.You measure the permeability of this membrane to oxygen.You are going to change the length of the hydrocarbon tails and remeasure membrane permeability,but first your boss asks you to graph the data you expect if there is no effect of hydrocarbon tail length on membrane permeability (your null hypothesis) .Which of the graphs below best represents the data you expect if your null hypothesis is correct?

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D)